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How a Single API Key and JSON Schema Can Unify Multi-Provider AI Classification

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A software architecture pattern proposes replacing separate OpenAI, Claude, and Gemini client integrations in Node.js apps with a single scoped API key backed by a strict JSON output contract. In this design, a Python classification worker translates incoming requests into chat completions, validates responses, and returns provider-neutral results, while a routing layer maps profiles like 'interactive' or 'batch' to specific models. Application code never receives or selects a provider model ID, keeping the caller isolated from backend routing decisions. The architecture emphasizes that the real value lies not in the shared key itself, but in a reusable eval suite that makes any model route change measurable and reversible. Without logging which model versions produced each result, the approach warns, model routing remains difficult to audit or defend.

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